body {
    font-family: 'Microsoft Yahei', '微软雅黑', simsun, Arial;
}


/* 头部 */

.clearfix::after {
    content: "";
    display: block;
    clear: both;
}

.banner {
    width: 100%;
    height: 700px;
    min-width: max-content;
    position: relative;
    overflow: hidden;
}

.banner .banner-one {
    height: 700px;
    width: 100%;
    background-image: url(https://shared-https.ydstatic.com/website/images/groupintro/banner1.png);
    background-repeat: no-repeat;
    background-position: center top;
    background-size: cover;
    /* position: relative; */
}

.banner .banner-one .banner-wrap {
    width: 1024px;
    padding-top: 146px;
    text-align: left;
    color: #fff;
    margin: 0 auto;
}

.banner .banner-one .banner-wrap h1 {
    font-size: 60px;
    letter-spacing: 1.2px;
    text-shadow: 0 2px 10px rgb(0 0 0 / 20%);
    font-weight: 400;
}

.banner .banner-one .banner-wrap h2 {
    font-size: 40px;
    letter-spacing: .8px;
    text-shadow: 0 2px 10px rgb(0 0 0 / 20%);
    margin-top: 8px;
    font-weight: 400;
}

.banner .banner-one .banner-wrap .to-group {
    display: inline-block;
    width: 200px;
    height: 56px;
    line-height: 56px;
    margin: 66px 0 22px;
    color: #fff;
    font-size: 19px;
    border-radius: 4px;
    -webkit-box-shadow: 0 6px 30px 0 rgb(65 112 239 / 16%);
    box-shadow: 0 6px 30px 0 rgb(65 112 239 / 16%);
    text-align: center;
    box-sizing: border-box;
    border: 1px solid #fff;
    background-color: rgba(255, 255, 255, 0);
}

.banner .banner-one .banner-wrap .top-play i {
    display: inline-block;
    background-image: url(https://co.youdao.com/styles/images/sprite_index-68253fabe3.png);
    background-position: -46px 0;
    width: 42px;
    height: 42px;
    margin-right: 13px;
    vertical-align: middle;
}

.sidebar {
    position: fixed;
    right: 12px;
    bottom: 50px;
    z-index: 999;
}

.sidebar .qiyu-tip>span {
    background-image: url(https://co.youdao.com/styles/images/sprite_common-1c308396d8.png);
    background-position: -94px -84px;
    width: 30px;
    height: 30px;
    display: block;
    margin: 15px;
}

.sidebar .back-top>span {
    background-image: url(https://co.youdao.com/styles/images/sprite_common-1c308396d8.png);
    background-position: -60px -84px;
    width: 30px;
    height: 30px;
    display: block;
    margin: 15px;
}


/* .sidebar .qiyu-tip>i:hover {
    display: none;
}

.sidebar .back-top>i:hover {
    display: none;
} */

.sidebar .tip {
    border: 1px solid #dadada;
    width: 60px;
    height: 60px;
    background-color: #fff;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.sidebar .tip .txt {
    /* display: none; */
    color: rgb(230, 10, 10);
    font-size: 14px;
    width: 62px;
    height: 60px;
    /* line-height: 60px; */
    text-align: center;
    padding-top: 8px;
    box-sizing: border-box;
    /* margin-top: 8px; */
    /* position: absolute;
    top: 0px;
    left: 0px; */
}

.top-des {
    width: 100%;
    height: 560px;
    border-bottom: 1px solid #e5e5e5;
}

.top-des-wrap {
    width: 960px;
    padding-top: 100px;
    text-align: center;
    margin: 0 auto;
}

.top-des-wrap h2 {
    font-size: 40px;
    font-weight: 500;
    color: #3c3c3c;
    margin-bottom: 55px;
}

.des-item {
    display: inline-block;
    margin: auto 85px;
}

.des-item img {
    width: 160px;
}

.des-item h3 {
    font-size: 20px;
    font-weight: 500;
    color: #393939;
    margin: 5px auto 12px;
}

.des-item p {
    font-size: 14px;
    line-height: 1.71;
    color: #898989;
}

.detail {
    width: 100%;
    padding: 122px 0 108px;
    border-bottom: 1px solid #d7d7d7;
}

.detail-wrap {
    width: 960px;
    margin: 0 auto;
}

.detail-item {
    height: 420px;
    position: relative;
    margin-bottom: 80px;
}

.detail-item img {
    width: 400px;
    position: absolute;
    top: 10px;
}

.detail-des {
    position: absolute;
    width: 416px;
    top: 125px;
}

.right {
    right: 0
}

.left {
    left: 0;
}

.detail-des h2 {
    font-weight: 500;
    font-size: 40px;
    color: #3c3c3c;
}

.detail-des h2 span {
    color: #398dee;
}

.detail-des h3 {
    font-size: 18px;
    line-height: 1.67;
    letter-spacing: 1.3px;
    color: #595959;
    margin: 16px 0 22px;
}

.detail-des p {
    font-size: 14px;
    line-height: 1.86;
    text-align: justify;
    color: #898989;
}

.security {
    width: 100%;
    height: 78px;
    background-color: #398dee;
}

.security-link {
    width: 960px;
    margin: 0 auto;
    text-align: center;
    padding: 14px 0;
}

.security-link a {
    display: inline-block;
    width: 220px;
    margin-right: 80px;
}

.security-link a img {
    width: 212px;
    height: 50px;
}

.footer {
    height: 380px;
    background-color: #31353a;
    margin-bottom: 0;
    color: #8a8e91;
    font-size: 14px;
    min-width: 1280px;
}

.ft-wrap {
    width: 960px;
    height: 100%;
    position: relative;
    text-align: left;
    margin: 0 auto;
}

.ft-wrap ul {
    position: absolute;
    top: 60px;
}

.ft-wrap .ul-1 {
    left: 0;
}

.ft-wrap ul .li-title {
    color: #fff;
    margin-bottom: 10px;
}

.footer .ft-wrap ul li {
    height: 32px;
    line-height: 32px;
}

.footer .ft-wrap a {
    color: #8a8e91;
}

.footer .ft-wrap ul.ul-2 {
    left: 256px;
}

.footer .ft-wrap ul.ul-3 {
    left: 512px;
}

.footer .ft-wrap ul.ul-4 {
    left: 768px;
    width: 300px;
}

.footer .ft-wrap ul li.online-help {
    width: 84px;
    height: 30px;
    line-height: 30px;
    border-radius: 2px;
    border: 1px solid #5f5f5f;
    text-align: center;
    margin-left: 0;
}

.footer .ft-wrap ul li.online-help:hover {
    border: 1px solid #ffffff;
    color: #ffffff;
}

.footer .ft-wrap ul li.online-help a:hover {
    color: #ffffff;
}

.footer .ft-wrap #copyright {
    position: absolute;
    bottom: 84px;
    left: 0;
    font-size: 12px;
    line-height: 2.67;
    letter-spacing: .2px;
    color: #fff;
}